1. Indicate how many 4-digit numbers smaller than 6,000 can be formed from the digits 2, 4, 5, 6, 8, 9? 2. Find the number of permutations of the word ENGINEERING. 3. Indicate how many 5-digit numbers can be formed from the digits 2, 3, 5, 6, 8, 9 where 6 and 9 must be included in all cases. 4. In how many ways can 6 persons formed a ring?

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